Questions tagged [blockchain]

This tag should be used for questions pertaining to the blockchain. The blockchain is a list of all transactions that have occurred using the Bitcoin currency. It consists of blocks which are linked to each other, and each block consists of transactions. DON'T USE THIS FOR THE SERVICE NAMED 'blockchain.info'!

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It only takes 20,000 computers to alter the Bitcoin blockchain?

Google says As of now, there are roughly 12,130 public nodes running on the Bitcoin network. So in a nearby small city, there are 70,000 people. If 1 household is assumed to have 3 people on average,...
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I'm Creating My Own Crypto Currency & Guidance Will Be Needed. No Premine I Want To Use Shabal 256 and Keccak [closed]

Ive downloaded Burst Files That Use Shabal 256 As A Mining Algorithm. I'm still in the process of learning and building. But what I want to do is use keccak as the blockchain and i want to use shabal ...
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What are some resources that would help me become a Blockchain developer?

I'm a backend developer with experience in web development and microservice architectures. I have already worked a lot with some languages like C#, Java, C++, etc. As my next step, I want to become ...
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If I sent the USDT to the scammer's ERC20 &TRC20 addresses, is there any chance to get them back? [closed]

I was scammed by a man from an online dating site, I lost everything but even in debt... After he got my trust and started teaching me how to invest in Bitcoin. He sent me a fake platform link, I ...
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Are there other defensibilities of Bitcoin? [closed]

Came across this great video explaining the network effects behind Bitcoin - https://www.youtube.com/watch?v=lEVxPwsOriY&list=PLsJrGp31IOeeguquyarPl87HIWLTaizi2&index=4 Do you think there are ...
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1answer
36 views

what is the confirmation section in the block info?

in the details of a bitcoin block there's a section called block confirmation (which is different than transaction confirmation), first i thought it was the number of the blocks that are created after ...
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1answer
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blockchain nodes that dont get the new block

i read somewhere that after 40 second of creating a new block in the blockchain there's still 5% of the nodes that does not have the block, what happens to them if they were offline or down at that ...
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1answer
29 views

what is block confirmation

in the details of a bitcoin block there's a section called block confirmation (which is different than transaction confirmation), first i thought it was the number of the blocks that are created after ...
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30 views

What is Denominator Output & Blockchain Observer Link [Bitcoin]

Can someone help me understand if can a blockchain observer link the inputs of a user to their change outputs in any way? While reading about blockchain observer links, I also came across the term &...
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Regarding the chainstate level db (UXTO)

Already found many useful information regarding the chainstats db. such as: What are the keys used in the blockchain levelDB (ie what are the key:value pairs)? But what is the meanning of the last ...
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Given a tx hash, is it possible to know if it's someone selling or buying bitcoin?

I'm working on a project that involves identifying sales and purchases in the Blockchain. Is there any way to do this with the blockchain.com API?
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Ethereum Batch Transaction - Using web3.BatchRequest() [migrated]

I am trying to batch multiple transactions into a single transaction. The point is to reduce transaction/gas fee which I would need to pay if I am making 5 separate transactions than combining all 5 ...
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1answer
260 views

How does validating a transaction get more and more hard?

As far as I know, to prevent double-spend attack and to confirm that a specific transaction is valid, miners have to go through all blocks in the blockchain and check the sender's history of ...
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1answer
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What stops a hacker changing the last block?

Say a hacker is tinkering with a receivers public key in the latest block in a chain such that they change it to their own public key and intercept the transaction. The verifying process is only ...
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Have I been scammed - Blockchain Liquidity front runner bot?

I hope you are well. I followed the instructions in this video https://youtu.be/Iv0kqEJXdfE EXACTLY as shown, and my created contract address is now showing "0" in value, after I previously ...
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What type of processes do smart contracts represent?

Smart contracts of blockchain technology are computer programs that are considered to automate business processes. My question is that what type of processes do smart contracts represent? For example, ...
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How Bitcoin transaction requests are sent to miners? [duplicate]

When we do any transactions in bitcoin we need to send the transaction request to some bitcoin miner. How do we find the available miners' address?
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6answers
129 views

Where does compensation to miners come from?

I am still learning so my terminologies might not be entirely accurate. But I understand that in the traditional model, if person A pays person B $10, then the banks subtract $10 from person A's ...
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How to fetch the last month's block and transactions from mempool?

I want to fetch last month's block and transactions from mempool using typescript. And then persist this to MongoDb. In mempool API-REST there is a code of "GET_Block". import mempoolJS from ...
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1answer
37 views

Rescan starts not from first block

I have a complete blockchain but when I set rescan = 1 in .conf file my bitcoind starts rescaning from 435000 block. How to start it from the first block? What's wrong with my blockchain?
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1answer
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How transactions or wallet balance are retrieved from bitcoin blockchain?

Using different blockchain explorers one can retrieve the wallet balance or transactions of address. My question is how does this query works do they search the whole blockchain for the related ...
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1answer
43 views

How did bitcoin spread its first rewards

I know that in the genesis block, Satoshi Nakamoto got 50 bitcoin's and there are certain rumors that the first transaction destinations, were are also to his other wallet's, but if he never spent any ...
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Curious about the Math that makes Bitcoin/Blockchain work ! Any good resources to learn it?

A bit of a background about me ; Computer Engineer but during my studies i didn't dive too deep into the maths , especially the maths that makes the blockchain and cryptography work looking for advice ...
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1answer
35 views

Is there any way to activate full 'leech' mode?

As I understand, bitcoin basically represents a situation where nodes are expected to (and do) serve other nodes in the network, information that represents the money of all transactions in that ...
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Can i recover missed phrase on p2sh wallet?

i have a wallet from past with p2sh format ,also i know my private key but i just lost 4 character of that,i tried few apps to recover that but no one works(they work on another wallets prefectly),i ...
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I WAS SENT BITCOINS IN A WRONG ADRESS ( the last digit is missing in the adresse )

i sent my wallet at coinbase to the sender today 355CXardXvii8T4MNbBaQbfJD7YQNdUf5a but the sender sent to a wrong adress 33 digits missing the 34th digit 355CXardXvii8T4MNbBaQbfJD7YQNdUf5 will the ...
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1answer
49 views

If NFTs are unique instances of data on a blockchain, what keeps a different chain from having the same piece of data?

I apologize, I tried to make the title as concise as I could. If a Blockchain, say the Bitcoin chain, has some NFT that exists uniquely (by definition of an NFT) on that blockchain, what prevents the ...
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1answer
26 views

What if there where no nodes to share a new block

I am fairly new to blockchain technology, so bear with me if i make mistakes So lets say there are 10 people trading a cryptocurrency 5 of them are online from 8 to 10 am and the other half on online ...
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2answers
101 views

How download whole blockchain and preprocess it for analysis?

Will be grateful for any information/starter points/tuts etc. For ex. this question (answers don't contain any "real" answer, any url to "blockchain files", any suggestion where to ...
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1answer
38 views

Can I somehow find the wallet id of every trade?

I know we can see the trade flow of BTC trades. Is it somehow possible to associate each trade to a waller? Ie. the initiator of the trade?
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1answer
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Block 9 Transaction 1 Output 0 ScriptPubKey openssl validation fails

I'm trying to check the public key which lies in the ScriptPubKey of output #0 of transaction #1 bloc #9 with openssl. I'm using Python to create a DER file, and openssl to check it. ScriptPubKey ...
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What is the best site/tool/way for finding the RSZ values of a bitcoin transaction? [duplicate]

The two most popular sites for doing this are down which are https://2coin.org/ and https://2xoin.com/getRSZfromRawTX/ with no indication they'll ever return to be usable. Can anyone here link any ...
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4answers
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How are funds verified?

I understand that transactions go into mempool and a miner "verifies" the transactions such as ensuring the user has the appropriate funds and correct signature. Specifically, how are ...
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1answer
42 views

Miner attack lightning network

Can miners attack lightning network making it unusable with the hope that the transaction are forced to be processed on-chain, and they earn more transaction fee?
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1answer
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developing hd wallet using bip32 and bip 39

I'm developing a HD wallet using C#. I want to use this wallet for multiple blockchains like bitcoin, ethereum, dogecoin etc... I've read that I should use bip32 for my wallet. i know what's bip32 but ...
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Ternary Merkle Tree - concatenation and Merkle Proof?

Unlike binary Merkle trees, ternary have 3 leaf nodes. I wanted to understand how do we eventually get to the Root Merkle node -- is it by concatenating in the pair of 3 (considering 3 leaves in every ...
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1answer
66 views

Coinbase to Blockchain Transaction

Hello everyone! Recently i received a cryptocurrency to my Blockchain Wallet. The Bitcoin was sent from Coinbase to my address - I waited for about an hour. And i don't see the transaction and the ...
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1answer
47 views

What is the Crypto in Metaverse

When I read about the Metaverse in today's crypto space, I think of Second Life and my understanding is that Metaverse as used in today's crypto space is basically Second Life with VR but this looks ...
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1answer
28 views

Saving diskspace in bitcoin with a sort of snapshot of the blockchain

I am reading that some people try to save diskspace in what information is stored in the blockchain. I am wondering if it is possible to save such a diskspace in taking a sort of snapshot of the ...
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0answers
65 views

how are new bitcoins created [duplicate]

I have read that new bitcoins are generated by a competitive and decentralized process called "mining" i want to know how the first coin was generated? From where is it genrated? Mining is ...
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1answer
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UNIX END TIME January 19, 2038 - Will it affect Timelock nLOCKTIME smart contracts past that date?

So UNIX END TIME is January 19, 2038. What will happen then to the btc TX that looks at Unixtime for nLOCKTIME transactions? Will any Locktime transaction past that date, say to 2040 be an issue? Or ...
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Reciever hasnt got my deposit [duplicate]

bascilly i deposited £91 in the receiver address on 3ocassion prior he says he not recieved deposit but on blockchain it was received from 7.17am Then the investor kindly tellsme at 2.30 pm its not ...
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1answer
49 views

How can a block validate a merkle-root if it is all hashed?

I am trying to understand how another block validates the transactions through the merkle root. Shouldn't it be impossible to know what hashes the merkle root is hashed from because you can't reverse ...
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1answer
86 views

public key to private key using HASH TABLE (Pollard's kangaroo for SECPK1)

I have done a little bit of research on HASH TABLE (Pollard's kangaroo for SECPK1) I was wondering if there is any way to extract the private key range using the public key or the public address..??
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Start mining without the need to downlod the 360gb blockchain

I am new to bitcoin mining but at least i understand the mathematics behind - the sha256 and finding nonce, i am a junior back-end developer. recently i have being interested in bitcoin mining, as way ...
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What is Jailing tx HASH?

I participate in the testnet (I am a validator), and one of the tasks is to force myself to go to jail and write a timestamp, jailing block height and jailing tx HASH, but as far as I know there are ...
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How do I get my money [duplicate]

I made a transaction on the mining fee of this collector bot and I never got the money though even though it says I did I payed and it seems that there is some proof that they have paid some others ...
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1answer
32 views

What function to use to model probabilistic bitcoin mining?

I would like to calculate profitability of various mining strategies. For that, i need to simulate many random mining intervals, that reflect probabilistic distribution of real block mining. What ...
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1answer
50 views

Lost Bitcoins Help [duplicate]

years and years ago I invested in bitcoins and I also got some free for signing up somewhere and since then I have had a new phone and don’t even have that computer anymore so now I am unsure of how ...
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2answers
98 views

Why blockchain new node verify all transactions in blocks?

Hello I'm the student studying blockchain and bitcoin. I have a question that why all node verify all transactions in blocks. I check if new node connect bitcoin network, then the all transactions in ...

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